Dúngal mac Selbaig was king of Dál Riata. His reign can best be placed in the years 723 to 726, beginning with the abdication of his father, Selbach mac Ferchair, who entered a monastery, and ending with rise of Eochaid mac Echdach of the Cenél nGabráin. The High Medieval praise poem Duan Albanach names Dúngal the Impetuous, and claims that he ruled for seven years.

For over a generation before Dúngal's reign the Cenél Loairn, to which he belonged, and the Cenél nGabráin had contested for control of Dál Riata. It seems that Dúngal's father had finally managed to defeat his rivals shortly before he abdicated. For whatever reason, Dúngal soon lost power to the Cenél nGabráin. His father left the monastery and attempted to restore his son, but failed.

While Dúngal was no longer king of Dál Riata after 726, it may be that he remained ruler of the Cenél Loairn. Certainly he retained some following. In 731, he burned Tairpert Boitir, most probably Tarbert on Loch Fyne which was in the lands of the Cenél nGabráin and possibly a portage site.

In 733 the Annals of Ulster report that Dúngal profaned Tory Island by forcibly removing Bruide, who is presumed to be the son of Óengus mac Fergusa, king of the Picts. This entry is followed by the statement that Dúngal's cousin, Muiredach mac Ainbcellaig, became king of the Cenél Loairn, and it seems probable that the rise of Muiredach, and Dúngal's epithet, stem from his doings on Tory Island.

In 734 Dúngal fled to Ireland, "to escape the power of Óengus". Dúngal later returned to Scotland, and was captured in 736, along with his brother Feredach, by Óengus. Their subsequent fates are unknown.

https://en.m.wikipedia.org/wiki/D%C3%BAngal_mac_Selbaig

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Dal Riata was the tribal and territorial name of the early tribes of County Antrim, particularly the northeast portion. The area later known as the Route (Rúta), in northern co. Antrim, is often equated with the Dal Riada. The Dal Riada extended their kingdom into Scotland probably during the 3rd to the 7th centuries. The early term that the Romans referred to these and other tribes from Ireland was the "Scoti".

In the time of Ptolemy, the Scoti occupied much of Ulster, including (some say) county Monaghan. Ultimately, the Romans used the word Scotia refer to refer to all of Ireland (Roman writers referrred to Ireland both as Scotia and Hibernia.), and Scoti to refer to all Irishmen. Early in the first millennium, the community of Dal Riada included both the north and northeast part of what is now county Antrim in Ireland and what is now county Argyll in Scotland. Travel over the narrow channel of water that separated the two parts of Dal Riada was easier than communication over land with other parts of Ireland. The seat of the king of the Dal Riada was in Ireland until about 490 A.D. when Fergus Mor MacEarca moved to what is now Scotland. For centuries before then, however, the kings of Dal Riada exercised control from Ireland over the Dal Riada in Scotland and, despite their location in what is now two countries, the people of Dal Riada were one community.

   "It has been stated that the kingship of Dal Riata was moved to Scotland with Fergus mac Earca and his descendants, and that later in the 6th century the lords of the Dal Riata in Ireland were also allied with their southern neighbors, the Dal Fiatach." Ancient Uladh—Kingdom of Ulster—Uladh, from Ireland's History in Maps.

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Links

http://magoo.com/hugh/scotskings.html

http://fmg.ac/Projects/MedLands/IRELAND.htm

https://en.wikipedia.org/wiki/Clan_MacLaren

Sources

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723-26: King of Argyll [Ref: Moriarty Plantagenet p278] defeated by Eochaid III King of Lorn, but again King of Argyll in 733[Ref: Moriarty Plantagenet p278] 736: captured and imprisoned by Oengus I King of Picts [Ref: Moriarty Plantagenet p278]

The Irish Version of the Historia Britonum of Nennius-https://books.google.com/books?id=sQ0GAAAAQAAJ&pg=PA281&lpg=PA281&d...

Chronicles of the Picts, chronicles of the Scots, and other early memorials ...-https://books.google.com/books?id=SaIUAAAAQAAJ&pg=PA61&lpg=PA61&dq=...

A History of the Scottish Highlands, Highland Clans and ..., Volume 2, Part 1-https://books.google.com/books?id=C1gJAAAAIAAJ&pg=PA75&lpg=PA75&dq=...

https://en.m.wikipedia.org/wiki/D%C3%BAngal_mac_Selbaig

Pedigrees of the Scottish Clans -From Irish and Scottish Ms.-http://clanmaclochlainn.com/pedigree.htm